Screw and nut device



L. KAMENAROVI SCREW AND NUT DEVICE Nov. 22, 1938.

Filed March 19, 1937 IHM Patented v Nov. 22, 1938 v UNITED STATES PATENT OFFICE soEEw AND NUT DEVICE Application March 19, 1937, Serial No. 131,970 In Italy March 28, 1936 6 Claims.

This invention has for its object a holder for an inductance coil having a magnetic core, particularly for high frequency electric currents, of the kind in which a section of said core is adjustable for varying the inductance value of said coil. v In known holders of the above class the adjustable section of the core is connected with the other section thereof or with supporting means for said core, by a screw engagement which provides for adjustment of said adjustable section; however objections are found in respect of the mounting of said adjustable core section because difficulties are found in securing in a simple l5 manner, a mounting which provides for adjusting the adjustable core section without undue effort and at the same time secures a fast engagement of said section in its adjusted position.

In accordance with this invention the adjustable core section is screw engaged in a seat provided by screw-threaded parts which are separated from each other and are carried by yieldable members supported along edges thereg5 of extending in a direction parallel to the axis of said seat and core section adjustable therein.

Twov embodiments of the present invention are illustrated by way of example on the annexed drawing and 30 Figure 1 is a vertical section of a holder of this invention with the coil and adjustable core therein in section on line I-I of Fig. 3;

Figure 2 is a side elevation of said holder,

Figure 3 is a top plan view thereof, and

35 Figure 4 is a top plan view of a modified embodiment.

In the embodiment illustrated in Figs. 1 3, said holder includes a body I made` of insulating material and having perforated lugs 2 for fas- 40 tening it on a support; said body encloses a winding 3 located within two opposite channel rings 4 and 5 which are made of a sintered ferromagnetic material and in their whole provide a hollow mantle core.

45 Hollow pillars 6 rise from the top wall I `of the body l. Said pillars extend substantially in the direction of the axis of the winding 3 and are arranged each in register with one vertex of a polygon having its centre on said winding axis;

50 further said pillars are open in their region facing the winding axis, as shown at 6".

Intermediate the pillars 6 oi each pair provided by adjacent ones, laminae 1 are located; the axially extending edges of said laminae I are connected with adjacent edges of saidv hollow (Cl. I4-424.8)

pillars 6 at the sides of their open portions 6" and said laminae are coextensive with the axis of the Winding 3.

The top wall I' of body I has slots along the edges of said laminae I adjacent thereto, to make 5 said` laminae freely yieldable with respect to wall I and to holder body I; said laminae I are provided each with a rib 'I' along its middle longitudinal line and sections of a screw thread are cut in said ribs the whole of the screw- 1g threaded portions thus obtained providing a sectional nut.

An adjustable core section 9, which is made of sintered ferromagnetic material, is mounted to slide in the central bore of the mantle core 5 and is engaged in a sleeve Ill which is screwthreaded on its outer surface and is screw-engaged in the screw-threaded portions 'I' of the laminae l; said sleeve I0 has grooves Il for its engagement by a screw-driver. gc

In the described holder in view of the yielding or resilient character of the laminae 'I-l which in their whole provide a screw-threaded seat for the movable section 9-I0 of the core, the said movable section may be easily adjusted with respect to the holder and mantle core d-- located therein; on the other hand said adjustable section 9-I0 is satisfactorily fastened in any adjusted position it' has. been carried into because the yielding and somewhat resilient laminae l are supported along the extensive extent of their side edges lying in the direction of the said screwthreaded seat and they evenly engage the adjustable section I0, 9 over their screwthreaded portions, a satisfactory engagement being thus secured along the full extent of the cooperating parts.

The embodiment illustrated in Fig. 4 is similar to the above described one, but it includes only two facing screw-threaded portions 1', 1' which 40 are provided in laminae 1; the laminae 'I are free fromthe transverse wall I' of the holder I by effect of slots 8 therein and are supported -by arcuated intermediate portions 6' connected with said top wall I.

The described holder conveniently consists of an integral member made of insulating material having a proper resilient or yielding material, but of course it may be made of any/appropriate material and may consist of a number of separate parts properly interconnected.

What I claim as my invention and desire to secure by United States Letters Patent is:-

1. A holder .for an adjustable screw threaded member, comprising a body, parts extending from said body parallel with and spaced from each other around an axis intermediate them, laminae each lying in a plane parallel with said axis and having edges coextensive and connected with two adjacent ones of said parts, and screwthreaded means on the inner faces of said laminae providing a sectional screw-threaded seat in the space enclosed by said laminae, said seat being adapted to receive said adjustable member.

2. A holder for an adjustable screw-threaded member, comprising a body, channel section parts extending from said body parallel with and spaced from each other around an axis intermediate them, lai iinae each lying in a plane parallel with said axis and having edges coextensive and connected v.' th the lateral edges of two adjacent ones of .aid parts, and screw-threaded means on the ir ner faces of said laminae providing a sectional screwthreaded seat in the space enclosed by said laminae, said seat being adapted to receive said adjustable member.

3. A holder lor an adjustable screw-threaded member, comprising a body, channel section parts extending from said body parallel with and spaced from each other around an axis intermediate them, said parts being open towards said intermediate axis, laminae each lying in a plane parallel with said axis and having edges coextensive and connected with the lateral edges of two adjacent ones of lsaid parts, and screw-threaded means on the inner faces of said laminae providing a sectional screw-threaded seat in the space enclosed by said laminae, said seat being adapted to receive said adjustable member.

4. A holder for an adjustable screw-threaded member, comprising a body, parts integral with and extending from said body parallel with and spaced from each other around an axis intermediate them, laminae separate from said body and each lying in a plane parallel with said axis and having edges coextensive and connected with two adjacent ones of said parts, and screwthreaded means on the inner faces of said laminae providing a sectional screw-threaded seat in the space enclosed by said laminae, said seat being adapted to receive said adjustable member.

5. A holder for an adjustable screw-threaded member, comprising a body, parts integral with and extending from said body parallel with and spaced from each other around an axis intermediate them, laminae separate from said body and each lying in a plane paraHel with said axis and having edges coextensive and integral with two adjacent ones oi said parts, and screwthreaded means on the inner faces of said laminae providing in the space enclosed by said laminae a sectional screw-threaded seat adapted to receive said adjustable member.

6. A holder for an adjustable screw-threaded member, comprising a body of insulating ma terial, parts integral with and extending from said body parallel with and spaced from each other around an axis intermediate them, laminae separate from said body and each lying in a plane parallel with said axis and having edges cocxtensve and integral with two adjacent ones of said parts, and screw-threaded means on the inner faces of said laminae providing in the space enclosed by said laminae a sectional screwthreaded seat adapted to receive said adjustable member.

LEONE KAMENAROVI. 

